build: remove mkdir docs command

Author: anonrig

.github/workflows/documentation.yml

@@ -22,7 +22,6 @@ jobs:
       - uses: actions/checkout@v3
       - name: Install Doxygen
         run: sudo apt-get install doxygen graphviz -y
-      - run: mkdir docs
       - name: Install theme
         run: ./tools/prepare-doxygen.sh
       - name: Generate Doxygen Documentation